Choose with confidence. Each Diamond Certified company has been independently rated Highest in Quality in Northern California’s most rigorous — and accurate — customer satisfaction research of local companies.

The Most Accurate Customer Satisfaction Research Anywhere

Ratings you can trust. We survey by telephone a large random sample of only REAL customers to ensure accuracy. To become Diamond Certified, a company must score over 90 on a 100 scale in customer satisfaction and pass our credential-based ratings. Most companies can’t qualify.

Telephone surveys are used to ensure only real customers are surveyed. Here Sarah Rutan enters a verified customer's survey response.

The Diamond Certified Difference

If you want quality, you’ll have confidence in choosing a Diamond Certified company. Our ratings process of local companies is the most accurate in the Bay Area. Only those rated Highest in Quality in customer satisfaction earn Diamond Certified. Most companies can't qualify.

Every Diamond Certified company must continue to deliver on its promises to you, the consumer. That's why we conduct ongoing customer satisfaction research, credential-based ratings, and monitor each company's performance. Then we back you up with mediation and the Diamond Certified Performance Guarantee.

Our Ratings are the Most Accurate Anywhere

We survey a large random sample of each company's customers by telephone to get the most accurate ratings and to verify that only REAL customers are responding. By surveying from a company's entire customer base, we ensure that the research results, good or bad, truly represent the company's customer satisfaction level.

Only the Best Pass the Test®

Companies must score Highest in Quality in customer satisfaction, a 90+ on a 100 scale, and pass all of our credential-based ratings. By requiring such a high score to qualify, we cut out mediocre and poorly performing companies.

There's Something Special About You™

Each of us is unique. That’s what makes us “individuals.” So, there’s something special about you™—many things, actually! Perhaps it’s something practical like being good at math or fun like being able to roll your tongue. You can now add one more thing that’s special about you simply by becoming a Diamond Certified Preferred Consumer (always free).

You’ll get special recognition from Diamond Certified companies, exclusive access to a members-only hotline, a subscription to the Diamond Certified Directories, a Double Diamond Certified Performance Guarantee and more. You deserve it—after all, there’s something special about you.™

Companies are Held Accountable

We conduct ongoing research and ratings. Companies must keep up their high performance. If they don't, they are removed from Diamond Certified.

We never allow a Diamond Certified company to sit on its reputation. Each must do their best to satisfy you, the customer.

We're Here for You

We care about customer satisfaction, and we care about you. That's why we perform the most accurate ratings, require the highest standard for qualification, and conduct regular performance reviews of Diamond Certified companies. We're proud to help you choose with confidence and we prove it by backing your Diamond Certified transaction with the powerful Diamond Certified Performance Guarantee.

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You’ll have confidence in your choice

–Phil M.

“When the floor refinisher I had hired told us at the last minute that he couldn’t do the job on time, I had to find a replacement fast. I went to Diamond Certified and found a company and the floors turned out great. Now the Diamond Certified site is the first place I go when I need to hire a pro.”

–Pansy K.

“For me, Diamond Certified is the place to go for high quality, ethical and reliable contractors and businesses. Diamond Certified businesses that I have used in the past do their best to make sure that they communicate well with me and that they stand by their work and their promises.”

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Diamond Certified Performance Guarantee

If you’re dissatisfied with the performance of a Diamond Certified company and try unsuccessfully to resolve the issue, we’re here to help. Contact us within six months of your purchase and we’ll provide mediation between you and the company. If the company fails to honor their contractual obligations, uphold industry standards, or participate in good faith to resolve the issue, we will refund your purchase price up to a limit of $1,000.

The Savvy Consumer

Chris Bjorklund
Consumer Advocate

Known as The Savvy Consumer, Chris Bjorklund has been a Consumer Advocate for over 35 years. She has worked with KPIX-TV, KGO, The Better Business Bureau, Consumer Reports, and as an Investigator for the Consumer Fraud Unit of the San Francisco District Attorney's Office. Chris puts her incredible consumer experience to work for you! Check out her blog for the latest consumer advice and tips.